It is a problem and it is not rhe landlord's responsibility to provide UPS or FedEx access to the building. USPS carriers are routinely given keys to get into buildings and when a landlord or management company will not permit USPS to have access, the landlord or management company must agree to install delivery units outside the building. That is a government rule. Private owners can treat private delivery companies however they see fit.
UPS and FedEx cannot, by law, use USPS-designated mail receptacles to deliver packages. If they can get into the building, they can place items at your apartment door, at your risk.
One way around the problem, and it works very well for me even though I am now retired and home most of the time, is to use my post office box, which I have had for over 30 years, to get my UPS and FedEx deliveries. This is something my post office started about eight years ago. Private delivery companies do not have direct access to USPS post office boxes, which is why, when you order something being shipped by them, they require a street address. Well, under this program USPS offers, you can now get these deliveries at your box. You supply the shipper with the street address of the post office your box is located at, followed by the box number, without the words PO Box. If your box # is 4567 and the post office is 123 Main St, you give '123 Main St #4567' as your shipping address.
UPS and FedEx are now going to post offices all over the country every day to drop off packages they have processed so that the Postal Service can do the actual delivery. Because they do this, they can drop your items at the post office at the same time. A postal clerk accepts them and does the delivery to your box, of either a notice that you take to the window to claim it, or they put it in a parcel locker and leave the key in your box and you help yourself. many larger offices now have 24-hour lobbies so you can access your box and parcel lockers at your convenience. Anything requiring you to go to the window must be done during business hours, but for most people, that beats driving across town.
I love it. I get an email notification that my FedEx item has been delivered, and UPS, I just check the tracking.